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Most softphone clients utilize the Session Initiation Protocol (SIP), an open standard that supports various audio and video codecs. Some systems, like Skype, operate on proprietary protocols but can integrate with SIP-based systems through specialized business telephone system (PBX) software.
The use of a mobile phone for offers the cheapest way overseas Filipino workers (OFW) to send money or remittances to their families back in the Philippines. Furthermore, in a study done in 2015 by the US-based Pew Research Center , 88% of Filipinos consider the internet good for education.
Aricent SIP UA stack, B2BUA, proxy, VoLTE/RCS Client; AskoziaPBX; Avaya Application Server 5300 (AS5300), JITC certified ASSIP VoIP; Bicom Systems IP PBX for telecoms; Brekeke PBX, SIP PBX for service providers and enterprises; Cisco SIP Proxy Server, Cisco unified border element (CUBE), Cisco Unified Communication Manager (CUCM)
Retail customers of an ITSP may use traditional analog telephone sets attached to an analog telephony adapter (ATA) to connect to the service provider's network via a local area network, they may use an IP phone, or they may connect a private branch exchange (PBX) system to the service via media gateways.
A SIP provider (Session Initiation Protocol) is any telecommunications company which provides SIP trunking to customers, usually businesses. Many companies provide SIP "termination" (outbound calling) and "origination" (inbound calling, usually with a plain old telephone service (POTS) phone number, called a direct inward dialing (DID).
Smart Communications Inc., commonly referred to as Smart, is a wholly owned wireless communications and digital services subsidiary of PLDT Inc., [1] a telecommunications and digital services provider based in the Philippines. [2] As of November 2023, it is currently the largest mobile network with 55.2 million subscribers. [3]
Clients that use the same protocol can typically federate and talk to one another. The following table compares general and technical information for cross-platform instant messaging clients in active development, each of which have their own article that provide further information.